Radio tube



April 3,

A. BINNEWEG, JR

RADIO TUBE Filed July 50, 1942 Patented Apr. 3, 41945 UNITED STATESPATENT OFFICE RADIO TUBE Abraham Binnewex, Jr., Oakland, Calif.Application July 30, 1942, Serial No. 452,855 9 Claims. (Cl. Z50-27.5)

My invention relates to improvements in vacuum tubes for radio and theobject of my improvement is to provide an electronic tube for generalradio purposes of suitable plastic material. Further objects are toprovide a tube wall cooled by circulating water, air, or other iluidthereagainst;

to provide simple quick means for assembling, taking apart, and elementreplacement; to provide means for sealing the tube and also to provide amethod of assembly. Further objects will appear from the followingdrawing and description.

In the drawing, Figure I is a vertical section of the tube, and FigureII a top view with part of the cap removed.

The tube consists of a. base I oi' porcelain or oi polystyrene or otherplastic material, provided with holes 2 for attachment to a radiochassis or base, a shell 3, fastened to the base I by bolts 4 and 5, anda cap 6 attached' or sealed to the top oi' the shell or case 3 bybolts 1. 'Ihe shell or case 3 is provided with a hollow space 8 withinthe shell wall for the circulation of cooling liquids or gases which mayenter at the orliice through screw 9, circulate against the wallspassing out through the hollow screw III. The outer wall could also begrooved i! no cooling chamber is used. The top. shell, and ybase neednot be of the same plastic material.

Within the shell is a thin, metallic, hollow, cylindrical or squareelectronic plate II of ordinary construction, preferably open at bothends, and within this plate is a cylindrical or square grid consistingof a plurality of vertical wires I2 encircled by a wire helix I3, or byloops. Within this grid is a hollow cathode I4, and within the cathode aheater iilament I5.

Wires lead from the various elements for electrical connection: gridlead Il, plate lead I8, cathode lead Ii. and filament leads I9. Theseleads, one or more to each element, pass through plastic or metalliccaps 20, and are cemented in place.

Through the shell cap S, pass two or more knurled or threaded tubes 2|,one use being for exhausting the shell. These are pinched together atthe end and may be soldered or welded. These tubes could Optionally beformed as a part oi' the tube top 3. 'I'he second tube is provided toserve as a connection to an element, or for reexhausting the elementchamber if the tube is opened to replace a part.

Grooves 22 are cast or cut in the inner wall of the shell. One purposeis to provide space and prevent radiorequency losses between plate II saand the shell wall. Such grooves could 'be omitted for small tubes. Softplastic gaskets 23 may be placed between shell 3 and base I, and alsobetween the shell and cap 6 to afford an air tight seal. Ii no waterchamber is needed, parts I and 3 could be formed in one piece.

Circular grooves 24 are provided in the bottom of the shell 3 forretaining the ends of plate, grid, similar grooves 25 are in the Extragrooves could be provided in between, of the same or of diierent depthsfor elements of diierent sizes. A threaded insert 26 serves to hold the`bolt 5. The bottom of the shell under insert 26 could also be gasketed.If the parts are carefully tted, no gaskets may benecessary.

By removing nuts 2l the cap 6 may be removed for the replacement offilaments or other parts. The parts of the shell, once proper ele mentsare found, can be permanently cemented together.

The complete electronic tube is assembled by placing the plastic disk Iflat and setting into the the desired cathode I4, the

the desired plate II.

cover 6 and the nuts caps 20 if used are then cemented at the sealedoriiices. One of the tubes 2I is plugged, and the can be cui; off andused again.

If exhaust; tube 2| is metallic, it may also be used as a grid leadmaking direct grid contact or by use of wire 28, connecting tube 2I andgrid The second exhaust tube could likewise be machine screw 5 the shell3 and the base I.

Having thus described the invention, what I claim is new is:

1. A vacuum tube comprising a cup-shaped dielectric receptacle, aremovable dielectric cap for said receptacle, circular grooves in thebottom of said receptacle, circular grooves in said cap, cy-

lindrical cathode, grid and plate elements held in place by saidgrooves, and means for removably aiiixing said cap to said receptacle.

2. A vacuum tube comprising a cup-shaped nonconducting receptacle, aremovable cap for said receptacle, conductive exhaust tubes perforatingsaid cap, concentrically disposed cathode, grid, and plate elementswithin said receptacle, and electric conductors connecting said elementsand said exhaust tubes.

3. The combination of a vacuum tube comprising a porcelain cup, awaterway in the walls of said cup, a removable cap for said cup, a.gasket between said cup and said cap, removable cathode, grid, and plateelements within said cup, a plurality of exhaust tubes penetrating saidcap, electric conductors connecting said tubes and said elements, and aporcelain base fon the tube removably attached thereto.

4. A vacuum tube having ber, an axial cathode within said chamber, aconductor from said cathode passing through the top of said chamber, agrid surrounding said cathode, a plate surrounding said grid, a lateralaperture in said plate.- a conductor attached to said grid,

passing through said aperture and through the wall of said chamber, anda conductor attached to said plate and passing through the wall of saidchamber.

5. A vacuum tube having an inner dielectric, cup-shaped chamber,insulated electrodes within said chamber, a removable dielectric cap forsaid chamber, 'an outer cylindrical chamber surrounding said'innerchamber and having walls integral at the top 'with the walls of saidinner chamber, an annular opening equal in diameter with said outerchamber for said outer chamber at the bottom of the tube, and aremovable closure for said outer chamber.

6. A radio tube comprising a cylindrical blocko 'tending upwardly nearlyto of dielectric material, a central cylindrical chamber extendingdownward nearly to the bottom of said block, an outer annular coolingchamber exthe top of saidblock and having an annular opening of equaldiameter therewith, a dielectric closure at the top for said innerchamber, and another closure at the bottom for said outer chamber, andconcentrically arranged electrodes within said central chamber.

7. A vacuum tube comprising a cup-shaped dielectric receptacle,aremovable dielectric cap for siad receptacle, corrugations on the innerwall of said receptacle, a cylindrical anode adjacent said corrugationsand supported thereby. a cylindrical grid enclosed by said anode andconcentric therewith, a cylindrical cathode at the center of saidreceptacle, and concentric circular grooves in the bottom of saidreceptacle and also in the under surface of said cap for holding inspaced relation said anode, grid, and cathode.

8. A radio tube comprising a cylindrical plastic receptacle integrallyclosed at the bottom, a plastic cap for said receptacle, said .cap to beused also as leads, concentric circular grooves in the bottom of saidreceptacle, similar grooves in the under surface of said cap, electrodessupported in spaced relation by said grooves, and conductors, eachconnecting. one of said electrodes with one of said exhaust tubes.

9. A radio tube having a cylindrical receptacle, an axial electrodewithin said receptacle, concentric cylindrical electrodes surroundingsaid axial electrode, holes in said surrounding electrodes, lateralholes in said receptacle, and wire conductors attached to saidelectrodes, thence passing through the holes in said electrodes and saidreceptacle to the exterior.

ABRAHAM BINNEWEG, J a.

metal exhaust tubes in

